What's the best hotel apps to use for frequent travellers?

I usually go through shopback app to see which hotel apps offer the best cash back. Agoda will be one of them.

I noticed agoda or trip.com hardly offer pay at property option.

I use expedia if you need to choose pay at property. Prefer to pay after stay.

I like trip.com as they have an excellent customer service team who managed to resolve my query within 1 day. after I got radio silence from the hotel for days.